/*
 * 68K/386 32-bit C compiler.
 *
 * copyright (c) 1997, David Lindauer
 * 
 * This compiler is intended for educational use.  It may not be used
 * for profit without the express written consent of the author.
 *
 * It may be freely redistributed, as long as this notice remains intact
 * and either the original sources or derived sources 
 * are distributed along with any executables derived from the originals.
 *
 * The author is not responsible for any damages that may arise from use
 * of this software, either idirect or consequential.
 *
 * v1.35 March 1997
 * David Lindauer, gclind01@starbase.spd.louisville.edu
 *
 * Credits to Mathew Brandt for original K&R C compiler
 *
 */
/*
 * inline assembler (386)
 */
#include        <stdio.h> 
#include        "expr.h" 
#include        "c.h" 
#include        "errors.h"
#include				"gen386.h"

extern long framedepth, stackdepth, lc_maxauto;

extern int asmline;
extern int lastch;
extern int prm_linkreg;
extern enum e_sym lastst;
extern long ival;
extern short *lptr ;
extern TABLE lsyms;
extern int nextlabel;
extern char lastid[];

ASMNAME *keyimage;
ASMREG *regimage;
static SYM *lastsym;
static enum e_op op;

ASMREG reglst[] = {
	{ "cs",am_seg,1,2 },
	{ "ds",am_seg,2,2 },
	{ "es",am_seg,3,2 },
	{ "fs",am_seg,4,2 },
	{ "gs",am_seg,5,2 },
	{ "ss",am_seg,6,2 },
	{ "al",am_dreg,0,1 },
	{ "cl",am_dreg,1,1 },
	{ "dl",am_dreg,2,1 },
	{ "bl",am_dreg,3,1 },
	{ "ah",am_dreg,4,1 },
	{ "ch",am_dreg,5,1 },
	{ "dh",am_dreg,6,1 },
	{ "bh",am_dreg,7,1 },
	{ "ax",am_dreg,0,2 },
	{ "cx",am_dreg,1,2 },
	{ "dx",am_dreg,2,2 },
	{ "bx",am_dreg,3,2 },
	{ "sp",am_dreg,4,2 },
	{ "bp",am_dreg,5,2 },
	{ "si",am_dreg,6,2 },
	{ "di",am_dreg,7,2 },
	{ "eax",am_dreg,0,4 },
	{ "ecx",am_dreg,1,4 },
	{ "edx",am_dreg,2,4 },
	{ "ebx",am_dreg,3,4 },
	{ "esp",am_dreg,4,4 },
	{ "ebp",am_dreg,5,4 },
	{ "esi",am_dreg,6,4 },
	{ "edi",am_dreg,7,4 },
	{ "st",am_freg,0,10 },
	{ "cr0",am_screg,0,4 },
	{ "cr1",am_screg,2,4 },
	{ "cr2",am_screg,3,4 },
	{ "cr3",am_screg,4,4 },
	{ "cr4",am_screg,5,4 },
	{ "cr5",am_screg,6,4 },
	{ "cr6",am_screg,7,4 },
	{ "cr7",am_screg,8,4 },
	{ "dr0",am_sdreg,0,4 },
	{ "dr1",am_sdreg,2,4 },
	{ "dr2",am_sdreg,3,4 },
	{ "dr3",am_sdreg,4,4 },
	{ "dr4",am_sdreg,5,4 },
	{ "dr5",am_sdreg,6,4 },
	{ "dr6",am_sdreg,7,4 },
	{ "dr7",am_sdreg,8,4 },
	{ "tr0",am_streg,0,4 },
	{ "tr1",am_streg,2,4 },
	{ "tr2",am_streg,3,4 },
	{ "tr3",am_streg,4,4 },
	{ "tr4",am_streg,5,4 },
	{ "tr5",am_streg,6,4 },
	{ "tr6",am_streg,7,4 },
	{ "tr7",am_streg,8,4 },
	{ "st",am_freg,0,4 },
	{ "byte", am_ext,akw_byte,0 },
	{ "word", am_ext,akw_word,0 },
	{ "dword", am_ext,akw_dword,0 },
	{ "fword", am_ext,akw_fword,0 },
	{ "qword", am_ext,akw_qword,0 },
	{ "tbyte", am_ext,akw_tbyte,0 },
	{ "ptr", am_ext, akw_ptr,0 },
	{ "offset", am_ext,akw_offset,0 },
	{ 0 , 0 , 0 },
};

static int floating;

void inasmini(void)
{
}
static void asm_err(int errnum)
{
	*lptr = 0;
	lastch = ' ';
	generror(errnum,0,0);
	getsym();
}
static ENODE *asm_ident(void)
{
	ENODE *node = 0;
	char *nm;
	int fn = FALSE;
	if (lastst != id)
		asm_err(ERR_IDEXPECT);
	else {
        SYM             *sp;
				ENODE *qnode = 0;
				nm = litlate(lastid);
				getsym();
/* No such identifier */
/* label, put it in the symbol table */
        if( (sp = gsearch(nm)) == 0 ) { 
                				sp = xalloc(sizeof(SYM)); 
				                sp->name = nm; 
        				        sp->storage_class = sc_ulabel; 
												sp->tp = xalloc(sizeof(TYP));
												sp->tp->type = bt_unsigned;
												sp->tp->uflags = UF_USED;
                				sp->value.i = nextlabel++; 
				                insert(sp,&lsyms); 
        				node = xalloc(sizeof(ENODE));
        				node->nodetype = en_labcon;
        				node->v.i = sp->value.i;
                }
        else    {
/* If we get here the symbol was already in the table
 */
foundsp:
								sp->tp->uflags |= UF_USED;
                switch( sp->storage_class ) {
                        case sc_static:
                        case sc_global:
                        case sc_external:
                        case sc_externalfunc:
												case sc_abs:
																sp->extflag = TRUE;
																if (sp->tp->type == bt_ptrfunc || sp->tp->type == bt_func || sp->tp->type == bt_ifunc) {
/* make a function node */
																	if (sp->tp->type == bt_ptrfunc)
                                		node = makenode(en_nacon,sp,0);
																	else
                                		node = makenode(en_napccon,sp,0);
isfunc:
																	if (sp->tp->type != bt_ptrfunc && sp->tp->type != bt_func && sp->tp->type != bt_ifunc)
																		generror(ERR_MISMATCH,0,0);
																}
																else
/* otherwise make a node for a regular variable */
																	if (sp->absflag)
                                		node = makenode(en_absacon,sp,0);
																	else
																		if (sp->tp->type == bt_func || sp->tp->type == bt_ifunc) {
																			fn = TRUE;
                                			node = makenode(en_napccon,sp,0);
																		}
																		else
																			if (sp->staticlabel)
																				node = makenode(en_nalabcon,(char *)sp->value.i,0);
																			else
                                				node = makenode(en_nacon,sp,0);
                                break;
                        case sc_const:
/* constants and enums */
                                node = makenode(en_icon,(char *)sp->value.i,0);
																break;
												case sc_label:
												case sc_ulabel:
        									node = xalloc(sizeof(ENODE));
        									node->nodetype = en_labcon;
        									node->v.i = sp->value.i;
													break;
                        default:        /* auto and any errors */
                                if( sp->storage_class != sc_auto && sp->storage_class != sc_autoreg) {
                                        gensymerror(ERR_ILLCLASS2,sp->name);
																}
																else {
/* auto variables */
															 		if (sp->storage_class == sc_auto)
                                		node = makenode(en_autocon,sp,0);
																	else if (sp->storage_class == sc_autoreg)
                                		node = makenode(en_autoreg,sp,0);
																	if (fn)
																		goto isfunc;
																}
                                break;
                        }

								(node)->cflags = 0;
                }
				lastsym = sp;
	}
	return node;
}
static ENODE * asm_label(void)
{
	char *nm = litlate(lastid);
	ENODE *node;
	SYM *sp;
				getsym();
/* No such identifier */
/* label, put it in the symbol table */
        if( (sp = search(lastid,&lsyms)) == 0 ) { 
                				sp = xalloc(sizeof(SYM)); 
				                sp->name = litlate(lastid); 
        				        sp->storage_class = sc_label; 
												sp->tp = xalloc(sizeof(TYP));
												sp->tp->type = bt_unsigned;
												sp->tp->uflags = 0;
                				sp->value.i = nextlabel++; 
				                insert(sp,&lsyms); 
                }
        else    {
					if (sp->storage_class == sc_label) {
						asm_err(ERR_DUPLABEL);
						return 0;
					}
					if (sp->storage_class != sc_ulabel) {
						asm_err(ERR_ALABEXPECT);
						return 0;
					}
					sp->storage_class = sc_label;
				}
		if (lastst != colon) {
			asm_err(ERR_ALABEXPECT);
			return 0;
		}
		getsym();
    node = xalloc(sizeof(ENODE));
    node->nodetype = en_labcon;
    node->v.i = sp->value.i;
		return node;
}
static int asm_getsize(void)
{
	int sz=0;
	switch (regimage->regnum) {
			case akw_byte: sz = 1; break;
			case akw_word: sz = 2; break;
			case akw_dword: sz = floating ? 6 : 4; break;
			case akw_fword: sz = 6; break;
			case akw_qword: sz = 8; break;
			case akw_tbyte: sz = 10; break;
			case akw_offset: sz = 4; break;
	};
	getsym();
	if (lastst == kw_asmreg) {
		regimage = keyimage;
		if (regimage->regtype == am_ext) {
			if (regimage->regnum != akw_ptr) {
				asm_err(ERR_AILLADDRESS);
				return 0;
			}
			getsym();
		}
	}
	if (lastst != kw_asmreg && lastst != openbr && lastst != id) {
		asm_err(ERR_AMODEEXPECT);
		return 0;
	}
	regimage=keyimage;
	return sz;
}
static int getscale (int *scale)
{
	if (lastst == star) {
		getsym();
		if (lastst == iconst && !*scale) 
			if (ival== 1 || ival==2 || ival==4 || ival==8) {
				if (ival < 3)	
					ival--;
				else
					ival = ival/4+1;
				*scale =ival;
				getsym();
				return 1;
			}
		asm_err(ERR_ASCALE);
		*scale = -1;
		return 1;
	}
	return 0;
}
int asm_enterauto(ENODE *node, int *reg1, int *reg2)
{
	if (node && (node->nodetype == en_autocon || node->nodetype == en_autoreg)) {
								int *vreg;
								if (*reg1 >=0 && *reg2 >=0) {
									asm_err(ERR_AINVINDXMODE);
									return 0;
								}
								if (reg1 < 0)
									vreg = reg1;
								else
									vreg = reg2	;
								*vreg = ESP;
								if (prm_linkreg) {
			          	*vreg = EBP;
								}
								return 1;
	}
	return 2;
}
static AMODE *asm_mem(void)
{
	int reg1=-1, reg2=-1, scale=0, temp,sz=0;
	ENODE *node=0;
	AMODE *rv;
	int gotident = FALSE,autonode = FALSE;
	while (TRUE) {
		int rg;
		getsym();
		regimage = keyimage;
		rg = regimage->regnum;
		switch(lastst) {
			case kw_asmreg:
				regimage = keyimage;
				if (regimage->regtype != am_dreg || regimage->size != 4) {
					asm_err(ERR_AINVINDXMODE);
					return 0;
				}	
				if (reg1 >= 0) {
					if (reg2 >=0) {
						asm_err(ERR_AINVINDXMODE);
						return 0;
					}
					reg2 = rg;
					getsym();
					getscale(&scale);
					if (scale == -1)
						return 0;
				}
				else {
					getsym();
					if (getscale(&scale)) {
						if (scale == -1)
							return 0;
						if (reg2 >= 0) {
							reg1 = reg2;
						}
						reg2 = rg;
					}
					else {
						reg1 = rg;
					}
				}
				break;
			case iconst:
				if (node)
					node = makenode(en_add,node,makenode(en_icon,(char *)intexpr(0),0));
				else
					node = makenode(en_icon,(char *)intexpr(0),0);
				break;
			case id:
				if (gotident) {
					asm_err(ERR_AINVINDXMODE);
					return 0;
				}
				node = asm_ident();
				gotident = TRUE;
				sz = lastsym->tp->size;
				switch(asm_enterauto(node,&reg1,&reg2)) {
					case 0:
						return 0;
					case 1:
						autonode = TRUE;
						break;
					case 2:
						autonode = FALSE;
						break;
				}
				break;
			default:
				asm_err(ERR_AILLADDRESS);
				return 0;
		}
		if (lastst == closebr) {
			getsym();
			break;
		}
		if (lastst != plus) {
			asm_err(ERR_AINVINDXMODE);
			return 0;
		}
	}
	if ((reg2 == 4 || reg2 == 5) && scale > 1) {
		asm_err(ERR_AINVINDXMODE);
		return 0;
	}
	rv = xalloc(sizeof(AMODE));
	if (node) {
		rv->offset = node;
	}
	if (reg1 >=0) {
		rv->preg = reg1;
		if (reg2 >=0) {
			rv->sreg = reg2;
			rv->scale = scale;
			rv->mode = am_indispscale;
		}
		else {
			rv->mode = am_indisp;
		}
	}
	else
		if (reg2 >=0) {
			rv->preg = -1;
			rv->sreg = reg2;
			rv->scale = scale;
			rv->mode = am_indispscale;
		}
		else
			rv->mode = am_direct;
	return rv;
}
static AMODE *asm_amode(int nosegreg)
{
	AMODE *rv=xalloc(sizeof(AMODE));
	int sz = 0,seg=0;
	lastsym = 0;
	switch (lastst) {
      case iconst:
        case iuconst:
        case lconst:
        case luconst:
        case cconst:
				case kw_asmreg:
				case openbr:
				case id:
					break;
				default:
					asm_err(ERR_AMODEEXPECT);
					return 0;
	}
	if (lastst== kw_asmreg) {
		regimage = keyimage;
		if (regimage->regtype == am_ext) {
			sz = asm_getsize();
			regimage = keyimage;
		}
	}
loop:
		switch (lastst) {
			case kw_asmreg:
				if (regimage->regtype == am_ext) {
					asm_err(ERR_ATOOMANYSPECS);
					return 0;
				}
				if (regimage->regtype == am_freg) {
						getsym();
						if (lastst == openpa) {
							getsym();
							if (lastst != iconst || ival < 0 || ival > 7) {
								asm_err(ERR_ANEEDFP);
								return 0;
							}
							getsym();
							needpunc(closepa,0);
						}
						else ival = 0;
						rv->preg = ival;
						rv->mode = am_freg;
						sz = 10;
					}
					else if (regimage->regtype == am_seg) {
						if (rv->seg) {
							asm_err(ERR_ATOOMANYSEGS);
							return 0;
						}
						rv->seg = seg = regimage->regnum;
						getsym();
						if (lastst == colon) {
							getsym();
							goto loop;
						}
						rv->mode = am_seg;
						sz = regimage->size;
					}
					else {
						rv->preg = regimage->regnum;
						rv->mode = regimage->regtype;
						sz = regimage->size;
						getsym();
					}
				break;
			case openbr:
				rv = asm_mem();
				break;
			case id:
				rv->mode = am_immed;
				rv->offset = asm_ident();
				rv->length = 4;
				if (rv->offset->nodetype == en_autocon || rv->offset->nodetype == en_autoreg) {
					asm_err(ERR_AUSELEA);
					return 0;
				}
				break;
      case iconst:
        case iuconst:
        case lconst:
        case luconst:
        case cconst:
                rv = make_immed(ival);
								getsym();
			          break;
			default:
				asm_err(ERR_AILLADDRESS);
				return 0;				
	}
	if (rv) {
		if (rv->seg) 
			if (nosegreg || rv->mode != am_dreg)
				if (rv->mode != am_direct && rv->mode != am_indisp && rv->mode != am_indispscale && rv->mode != am_seg) {
					asm_err(ERR_ATOOMANYSEGS);
					return 0;
				}
		if (!rv->length)
			if (sz)	
				rv->length = sz;
			else if (lastsym)
				rv->length = lastsym->tp->size;
		if (rv->length < 0)
			rv->length = - rv->length;
		rv->seg = seg;
	}
	return rv;
}
static AMODE *asm_immed(void)
{
	AMODE *rv;
	switch(lastst) {
      case iconst:
        case iuconst:
        case lconst:
        case luconst:
        case cconst:
                rv = make_immed(ival);
								rv->length = 4;
								getsym();
								return rv;
	}
	return 0;
}
int isrm(AMODE* ap, int dreg_allowed)
{
	switch (ap->mode) {
		case am_dreg:
			return dreg_allowed;
		case am_indisp:
		case am_direct:
		case am_indispscale:
			return 1;
		default:
			return 0;
	}
}
AMODE *getimmed(void)
{
	AMODE *rv;
	switch(lastst) {
      case iconst:
        case iuconst:
        case lconst:
        case luconst:
        case cconst:
                rv = make_immed(ival);
								getsym();
								return rv;
			default:
				return 0;
	}
}
enum e_op asm_op(void)
{
	int op;
	if (lastst != kw_asminst) {
		asm_err(ERR_AINVOP);
		return -1;
	}
	op = keyimage->atype;
	getsym();
	floating = op >= op_f2xm1;
	return op;
}
static OCODE *make_ocode(AMODE *ap1, AMODE *ap2, AMODE *ap3)
{
	OCODE *o = xalloc(sizeof(OCODE));
	o->oper1 = ap1;
	o->oper2 = ap2;
	o->oper3 = ap3;
	return o;
}
static OCODE *ope_math (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap1->mode != am_dreg) {
		if (ap2->mode != am_immed && ap2->mode != am_dreg)
			return (OCODE *)-1;
	}
	else
		if (!isrm(ap2,TRUE) && ap2->mode != am_immed)
			return (OCODE *)-1;
	if (ap2->mode != am_immed)
		if (ap1->length && ap2->length && ap1->length != ap2->length)
			return (OCODE *) -2;

	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_arpl (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
 	if (ap2->mode != am_dreg)
		return (OCODE *)-1;
	if (!ap1->length || !ap2->length || ap1->length != ap2->length || ap1->length != 2)
		return (OCODE *) -2;

	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_bound (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
  if (ap1->mode != am_dreg)
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (!isrm(ap2,FALSE))
		return (OCODE *)-1;
	switch(ap1->length) {
		case 1:
			return (OCODE *)-1;
		case 2:
			if (ap2->length != 4) {
				return (OCODE *) -2;
			}
			break;
		case 4:
			if (ap2->length != 8) {
				return (OCODE *) -2;
			}
			break;
	}
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_bitscan (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode != am_dreg)
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (!isrm(ap2,TRUE))
		return (OCODE *)-1;
	if (ap1->length == 1 || ap2->length != ap1->length)
		return (OCODE *) -2;
	return make_ocode(ap1,ap2,0);
	
}
static OCODE *ope_bit (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2) 
		return 0;
	if (ap2->mode != am_immed && ap2->mode != am_dreg)
		return (OCODE *)-1;
	if (ap1->length == 1 || ap2->mode == am_dreg && ap2->length == 1)
		return (OCODE *) -2;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_call (void)
{  
	AMODE *ap1=asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode == am_immed) {
		if (ap1->offset->nodetype != en_nalabcon && ap1->offset->nodetype != en_labcon 
				&& ap1->offset->nodetype != en_napccon || ap1->seg)
			return (OCODE *)-1;
	}
	else {
		if (!isrm(ap1,TRUE))
			return (OCODE *)-1;
		if ((ap1->length != 4) && (ap1->length != 6))
			return (OCODE *) -2;
	}
	return make_ocode(ap1,0,0);
}
static OCODE *ope_incdec (void)
{
	AMODE *ap1=asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	if (ap1->length >4) {
		return (OCODE *) -2;
	}
	return make_ocode(ap1,0,0);
}
static OCODE *ope_rm (void)
{
	return(ope_incdec());
}
static OCODE *ope_enter (void)
{
	AMODE *ap1, *ap2;
	ap1 = asm_immed();
	if (!ap1)
		return 0;
	needpunc(comma,0);
	ap2 = asm_immed();
	if (!ap2)
		return 0;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_imul (void)
{
	AMODE *ap1 = asm_amode(TRUE),*ap2=0,*ap3=0;
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	if (lastst == comma) {
		getsym();
		ap2 = asm_amode(TRUE);
		if (lastst == comma) {
			getsym();
			ap3 = asm_amode(TRUE);
		}
	}
	if (ap2) {
		if (ap1->mode != am_dreg || ap1->length == 1)
			return (OCODE *)-1;
		if (!isrm(ap2,TRUE) && ap2->mode != am_immed)
			return (OCODE *)-1;
		if (ap3)
			if (ap2->mode == am_immed || ap3->mode != am_immed)
				return (OCODE *)-1;
	}
	return make_ocode(ap1,ap2,ap3);
}
static OCODE *ope_in (void)
{
	AMODE *ap1 = asm_amode(TRUE),*ap2;
	if (!ap1)
		return 0;
	if (ap1-> mode != am_dreg || ap1->preg != 0)
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap2->mode != am_immed &&( ap2->mode != am_dreg || ap2->preg != 2 || ap2->length !=2))
		return (OCODE *)-1;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_imm8 (void)
{
	AMODE *ap1 = asm_immed();
	if (!ap1)
		return 0;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_relbra (void)
{
	AMODE *ap1=asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode != am_immed)
		return (OCODE *)-1;
	if (ap1->offset->nodetype != en_nalabcon && ap1->offset->nodetype != en_labcon)
	  return (OCODE *)-1;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_relbr8 (void)
{
	return ope_relbra();
}
static OCODE *ope_jmp (void)
{
	return ope_call();
}
static OCODE *ope_regrm (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1) 
		return 0;
	if (ap1->mode != am_dreg)
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2) 
		return 0;
	if (!isrm(ap2,TRUE))
		return (OCODE *)-1;
	if (op == op_lea && ap2->mode == am_dreg)
		return (OCODE *)-1;
	if (ap2->length && ap1->length != ap2->length || ap1->length == 1)
		return (OCODE *)-2;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_loadseg (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode != am_dreg)
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (!isrm(ap2,TRUE))
		return (OCODE *)-1;
	if (ap1->length != 4 || ap2->length != 6)
		return (OCODE *)-1;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_lgdt (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
 	if (!isrm(ap1,FALSE) || ap1->length != 6)
		return (OCODE *)-1;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_lidt (void)
{
	return ope_lgdt();
}
static OCODE *ope_rm16 (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
  if (!isrm(ap1,TRUE) || ap1->length != 2)
		return (OCODE *)-1;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_mov (void)
{
	AMODE *ap1 = asm_amode(TRUE),*ap2;
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE) && ap1->mode != am_seg && ap1->mode != am_screg && ap1->mode != am_sdreg && ap1->mode != am_streg)
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap1->mode == am_dreg) {
		if (!isrm(ap2,TRUE) && ap2->mode != am_immed && (ap2->length != 4 || (ap2->mode != am_screg && ap2->mode != am_sdreg && ap2->mode != am_streg)))
			return (OCODE *)-1;
	}
	else if (isrm(ap1,TRUE)) {
		if (ap2->mode != am_dreg && ap2->mode != am_immed && ap2->mode != am_seg)
			return (OCODE *)-1;
	}
	else if (ap1->mode == am_seg) {
		if (!isrm(ap2,TRUE))
			return (OCODE *)-1;
	}
	else if (ap2->length != 4 || ap2->mode != am_dreg)
		return (OCODE *)-1;
	if (ap1->length && ap2->length && ap1->length != ap2->length)
		return (OCODE *) -2;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_movsx (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
 	if (ap1->mode != am_dreg)
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (!isrm(ap2,TRUE))
		return (OCODE *)-1;
	if (!ap2->length || ap1->length <= ap2->length) {
		asm_err(ERR_AINVSIZE);
	}
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_out (void)
{
	AMODE *ap1 = asm_amode(TRUE),*ap2;
	if (!ap1)
		return 0;
	if (ap1->mode != am_immed &&( ap1->mode != am_dreg || ap1->preg != 2 || ap1->length !=2))
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap2-> mode != am_dreg || ap2->preg != 0)
		return (OCODE *)-1;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_pushpop (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE) && ap1->mode != am_seg && ap1->mode != am_immed || (ap1->mode == am_immed && op == op_pop))
		return (OCODE *)-1;
	if (ap1->mode != am_immed && ap1->length !=2 && ap1->length != 4 ) {
		return (OCODE *) -2;
	}
	if (op == op_pop && ap1->mode == am_seg && ap1->seg == 1)
		return (OCODE *) -1;
	return make_ocode (ap1,0,0);
}
static OCODE *ope_shift (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(2);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap2->mode != am_immed && ap2->mode != am_dreg)
		return (OCODE *)-1;
	if (ap2->mode == am_dreg)
		if (ap2->preg != 1 || ap2->length != 1)
			return (OCODE *)-1;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_ret (void)
{
	AMODE *ap1 ;
	if (lastst != iconst)
		return make_ocode(0,0,0);
	ap1 = asm_amode(TRUE);
	return make_ocode(ap1,0,0);
}
static OCODE *ope_set (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
  if (!isrm(ap1,TRUE) || ap1 ->length != 1)
		return (OCODE *)-1;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_shld (void)
{
	AMODE *ap1,*ap2,*ap3;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap2->mode != am_dreg || ap2->length == 1)
		return (OCODE *)-1;
	if (ap1->length != ap2->length) {
		asm_err(ERR_AINVSIZE);
	}
	needpunc(comma,0);
	ap3 = asm_amode(TRUE);
	if (!ap3)
		return 0;
	if (ap3->mode != am_immed && ap3->mode != am_dreg)
		return (OCODE *)-1;
	if (ap3->mode == am_dreg)
		if (ap3->preg != 1 || ap3->length != 1)
			return (OCODE *)-1;
	return make_ocode(ap1,ap2,ap3);
}
static OCODE *ope_test (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap2->mode != am_dreg && ap2->mode != am_immed)
		return (OCODE *)-1;
	if (ap2->mode == am_dreg && ap1->length != ap2->length) {
		return (OCODE *) -2;
	}
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_xchg (void)
{
	AMODE *ap1, *ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap1->mode == am_dreg) {
		if (!isrm(ap2,TRUE))
			return (OCODE *)-1;
	}
	else
		if (ap2->mode != am_dreg)
			return (OCODE *)-1;
	if (ap1->length != ap2->length)
		return (OCODE *)-2;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_fmath (void)
{
	AMODE *ap1, *ap2=0;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (isrm(ap1,FALSE)) {
		if (ap1->length != 6 && ap1->length != 8)
			return (OCODE *) -2;
	}
	else {
		if (ap1->mode != am_freg)
			return (OCODE *)-1;
		needpunc(comma,0);
		ap2 = asm_amode(TRUE);
		if (ap2->mode != am_freg)
			return (OCODE *)-1;
		if (ap1->preg && ap2->preg)
			return (OCODE *)-1;
	}
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_fmathp (void)
{
	AMODE *ap1, *ap2;
	if (lastst != kw_asmreg)
		return make_ocode(0,0,0);
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode != am_freg)
		return (OCODE *)-1;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap2->mode != am_freg)
	  return (OCODE *)-1;
	if (ap1->preg && ap2->preg)
	  return (OCODE *)-1;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_fmathi (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (isrm(ap1,FALSE)) {
		if (ap1->length != 6 && ap1->length != 2)
			return (OCODE *) -2;
	}
	else {
		return (OCODE *)-1;
	}
	return make_ocode(ap1,0,0);
}
static OCODE *ope_fcom (void)
{
	AMODE *ap1;
	if (lastst != kw_asmreg && lastst != openbr)
		return make_ocode(0,0,0);
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (isrm(ap1,FALSE)) {
		if (ap1->length != 6 && ap1->length != 8)
			return (OCODE *) -2;
	}
	else {
		if (ap1->mode != am_freg)
			return (OCODE *)-1;
	}
	return make_ocode(ap1,0,0);
}
static OCODE *ope_freg (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode != am_freg)
		return (OCODE *)-1;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_ficom (void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,FALSE))
		return (OCODE *)-1;
	if (ap1->length != 2 && ap1->length != 6)
		return (OCODE *)-2;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_fild (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (! isrm(ap1,FALSE))
		return (OCODE *)-1;
	if (ap1->length != 2 && ap1->length != 6 && ap1->length != 8)
		return (OCODE *) -2;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_fist (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (! isrm(ap1,FALSE))
		return (OCODE *)-1;
	if (ap1->length != 2 && ap1->length != 6)
		return (OCODE *) -2;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_fld (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (isrm(ap1,FALSE)) {
		if (ap1->length != 6 && ap1->length != 8 && ap1->length != 10)
			return (OCODE *) -2;
	}
	else if (ap1->mode != am_freg)
		return (OCODE *)-1;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_fst (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (isrm(ap1,FALSE)) {
		if (ap1->length != 6 && ap1->length != 8)
			return (OCODE *) -2;
	}
	else if (ap1->mode != am_freg || ap1->preg == 0)
		return (OCODE *)-1;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_fstp (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (isrm(ap1,FALSE)) {
		if (ap1->length != 6 && ap1->length != 8 && ap1->length != 10)
			return (OCODE *) -2;
	}
	else if (ap1->mode != am_freg || ap1->preg == 0)
		return (OCODE *)-1;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_fucom (void)
{
	AMODE *ap1;
	if (lastst != kw_asmreg)
		return make_ocode(0,0,0);
 	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode != am_freg || ap1->preg == 0)
		return (OCODE *)-1;
	return make_ocode(ap1,0,0);
												
}
static OCODE *ope_fxch (void)
{
	return ope_fucom();
}
static OCODE *ope_mn (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,FALSE))
		return (OCODE *)-1;
	ap1->length = 10;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_m16 (void)
{
	AMODE *ap1;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (!isrm(ap1,TRUE))
		return (OCODE *)-1;
	if (ap1->mode == am_dreg)
		if  (op != op_fstsw && op != op_fnstsw && op != op_fldsw && ap1->preg != 0) 
			return (OCODE *)-1;
	if (ap1->length != 2)
		return (OCODE *) -2;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_cmps(void)
{
	AMODE *ap1,*ap2;
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	needpunc(comma,0);
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	if (ap1->mode != am_indisp || ap2->mode != am_indisp)
		return (OCODE *)-1;
	if (ap1->preg != 6 || ap2->preg != 7)
		return (OCODE *)-1;
	if (ap1->offset || ap2->offset)
		return (OCODE *)-1;
	if (!ap1->seg || ap2->seg != 3)
		return (OCODE *)-1;
	if (!ap1->length && !ap2->length)
		return (OCODE *)-2;
	return make_ocode(ap1,ap2,0);
}
static OCODE *ope_ins(void)
{
	AMODE *ap1,*ap2;
		ap1 = asm_amode(TRUE);
		if (!ap1)
			return 0;
		needpunc(comma,0);
		ap2 = asm_amode(TRUE);
		if (!ap2)
			return 0;
		if (ap1->mode != am_indisp || ap2->mode != am_dreg)
			return (OCODE *)-1;
		if (ap1->offset)
			return (OCODE *)-1;
		if (ap1->preg != 7 || ap2->preg != 2)
			return (OCODE *)-1;
		if (ap2->seg || ap1->seg != 3)
			return (OCODE *)-1;
		if (ap2->length != 2 || !ap1->length)
			return (OCODE *)-2;
		return make_ocode(ap1,ap2,0);
}
static OCODE *ope_lods(void)
{	
	AMODE *ap1,*ap2;
		ap1 = asm_amode(TRUE);
		if (!ap1)
			return 0;
		if (ap1->mode != am_indisp || ap1->offset)
			return (OCODE *)-1;
		if (ap1->preg != 6)
			return (OCODE *)-1;
		if (!ap1->length)
			return (OCODE *)-2;
		return make_ocode(ap1,0,0);
}
static OCODE *ope_movs(void)
{
	AMODE *ap1,*ap2;
	ap2 = asm_amode(TRUE);
	if (!ap2)
		return 0;
	needpunc(comma,0);
	ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode != am_indisp || ap2->mode != am_indisp)
		return (OCODE *)-1;
	if (ap1->preg != 6 || ap2->preg != 7)
		return (OCODE *)-1;
	if (ap1->offset || ap2->offset)
		return (OCODE *)-1;
	if (!ap1->seg || ap2->seg != 3)
		return (OCODE *)-1;
	if (!ap1->length && !ap2->length)
		return (OCODE *)-2;
	return make_ocode(ap2,ap1,0);
}
static OCODE *ope_outs(void)
{
	AMODE *ap1,*ap2;
		ap1 = asm_amode(TRUE);
		if (!ap1)
			return 0;
		needpunc(comma,0);
		ap2 = asm_amode(TRUE);
		if (!ap2)
			return 0;
		if (ap2->mode != am_indisp || ap1->mode != am_dreg || ap2->offset)
			return (OCODE *)-1;
		if (ap2->preg != 6 || ap1->preg != 2)
			return (OCODE *)-1;
		if (ap1->seg || ap2->seg != 2)
			return (OCODE *)-1;
		if (ap1->length != 2 || !ap2->length)
			return (OCODE *)-2;
		return make_ocode(ap1,ap2,0);
	
}
static OCODE *ope_scas(void)
{
	AMODE *ap1,*ap2;
		ap1 = asm_amode(TRUE);
		if (!ap1)
			return 0;
		if (ap1->mode != am_indisp || ap1->offset)
			return (OCODE *)-1;
		if (ap1->preg != 7)
			return (OCODE *)-1;
		if (ap1->seg != 3)
			return (OCODE *)-1;
		if (!ap1->length)
			return (OCODE *)-2;
		return make_ocode(ap1,0,0);
}
static OCODE *ope_xlat(void)
{
	AMODE *ap1,*ap2;
		ap1 = asm_amode(TRUE);
		if (!ap1)
			return 0;
		if (ap1->mode != am_indisp || ap1->offset)
			return (OCODE *)-1;
		if (ap1->preg != 3)
			return (OCODE *)-1;
		if (ap1->length && ap1->length != 1)
			return (OCODE *)-2;
		ap1->length = 1;
		return make_ocode(ap1,0,0);
}
static OCODE *ope_reg32(void)
{
	AMODE *ap1 = asm_amode(TRUE);
	if (!ap1)
		return 0;
	if (ap1->mode != am_dreg)
		return (OCODE *)-1;
	if (ap1->length != 4)
		return (OCODE *)-2;
	return make_ocode(ap1,0,0);
}
static OCODE *ope_stos(void)
{
	return ope_scas();
}
OCODE *(*funcs[])(void) = {
	0, ope_math,ope_arpl,ope_bound ,ope_bitscan ,ope_bit ,ope_call ,ope_incdec, 
	ope_rm ,ope_enter ,ope_imul ,ope_in ,ope_imm8 ,ope_relbra ,ope_relbr8, 
	ope_jmp ,ope_regrm ,ope_loadseg ,ope_lgdt ,ope_lidt ,ope_rm16 ,ope_mov ,
	ope_movsx ,ope_out ,ope_pushpop ,ope_shift ,ope_ret ,ope_set ,ope_shld ,
	ope_test ,ope_xchg ,ope_fmath ,ope_fmathp ,ope_fmathi ,ope_fcom ,ope_freg ,
	ope_ficom ,ope_fild ,ope_fist ,ope_fld ,ope_fst ,ope_fstp ,ope_fucom ,
	ope_fxch ,ope_mn, ope_m16, ope_cmps, ope_ins, ope_lods, ope_movs,
	ope_outs, ope_scas, ope_stos, ope_xlat, ope_reg32  };
SNODE *asm_statement (int shortfin)
{
	SNODE *snp=0, **snpp = &snp;
	OCODE *rv;
	ENODE *node;
	ASMNAME *ki;
	int iserr = 0;
	lastsym = 0;
	do {
		(*snpp) = xalloc(sizeof(SNODE));
		(*snpp)->stype = st_asm;
		(*snpp)->label = 0;
		(*snpp)->exp = 0;
		(*snpp)->next = 0;
		if (lastst != kw_asminst) {
			if (lastst == kw_int) {
				getsym();
				op = op_int;
				rv = ope_imm8();
				goto join;
			}
			node = asm_label();
			if (!node)
				return (*snpp);
			asmline = shortfin;
			if (lastst==semicolon)
				getsym();
			(*snpp)->stype = st_label;
			(*snpp)->label = (SNODE *)node->v.i;
			return (*snpp);
		}
		ki = keyimage;
		op = asm_op();
		if (op == -1)
			return (*snpp);
		if (keyimage->amode == 0) {
			rv = xalloc(sizeof(OCODE));
			rv->oper1=rv->oper2=rv->oper3 = 0;
		}
		else {
			rv = (*funcs[ki->amode])();
join:
			if (!rv || rv == (OCODE *)-1 || rv == (OCODE *)-2) {
				if (rv == (OCODE *)-1 )
					asm_err(ERR_AILLADDRESS);
				if (rv == (OCODE *)-2 )
					asm_err(ERR_AINVSIZE);
				iserr=1;
				return (snp);
			}
		}
		if (rv->oper1 && rv->oper2) {
			if (!rv->oper1->length)
				if (!rv->oper2->length) {
					asm_err(ERR_AINVSIZE);
					iserr=1;
				}
				else
					rv->oper1->length = rv->oper2->length;
			else
				if (!rv->oper2->length)
					rv->oper2->length = rv->oper1->length;
		}
		rv->noopt = TRUE;
		rv->opcode = op;
		rv->fwd = rv->back = 0;
		(*snpp)->exp = rv;
		snpp = &(*snpp)->next;
	} while (op == op_rep || op == op_repnz || op == op_repz || op == op_repe || op == op_repne || op == op_lock);
	asmline = shortfin;
	if (!iserr)
		needpunc(semicolon,0);
	else if (lastst == semicolon)
		getsym();
	return (snp);
}